[V8] (no subject)

[S_Matus]

Try putting a surge suppressor (condensor or a capacitor) across the Compressor clutch.  That would reduce the voltage spike when the clutch cycles on and off.  It should be at least 20 volt or you could blow it.
 
Scott.
 
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Message: 1
Date: Thu, 19 Feb 2004 12:23:22 +1000
From: greg.moyle at mainroads.qld.gov.au
Subject: [V8] Missfire with A/C on
To: V8 at audifans.com
Message-ID:
	<OF093EA732.8A31CCC8-ON4A256E3F.000C4710 at transport.qld.gov.au>
Content-Type: text/plain; charset="us-ascii"

Help,
My 90 V8Q auto has developed a misfire or more a total cut-out but only
when the A/C is running. It seems to only be a problem above 2000rpm so
cruising around town isn't to much of a problem. When highway cruising the
motor seems to cut out momentarily every 40 seconds or so but sometimes
will run for a couple of minutes before doing so. The cut-out is so bad
sometimes the box will drop into limp mode but a restart will fix that.
Without the A/C on no problems even under heavy acceleration. This weekend
we have 41 degrees Celsius so the Black Audi will be staying home I think,
not much fun in a black car in that heat with no air.

Any advice would be greatly appreciated.

Cheers
Downunder Greg

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Message: 2
Date: Sun, 22 Feb 2004 19:24:13 -0500
From: Kneale Brownson <knotnook at traverse.com>
Subject: Re: [V8] Missfire with A/C on
To: greg.moyle at mainroads.qld.gov.au, V8 at audifans.com
Message-ID: <4.1.20040222191648.00b9c860 at traverse.com>
Content-Type: text/plain; charset="us-ascii"

On my 200q20v I had the same issue that was the subject of an Audi recall
fix way back when.   Seems the clutch in the A/C compressor kicks up a jolt
of power that gives the ECU  a shock.  Another symptom common to this
problem is a loud pop heard on the radio when the jolt occurs.  The fix was
to replace the A/C relay and install a little wiring harness insert into
the wiring to the compressor clutch.  There's discussion of this issue on
Scott Mockry's website:  http://www.sjmautotechnik.com/elec.html#click
That little harness and relay were pretty pricey from the dealer.  Scott
may have a better price.




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